Dahsah, C., Sanguanruang, S., Sung-Ong, S., & Yutakom, N. (2006). Grade 10 and 11 Thai Students’ Conceptions about Stoichiometry. Kasetsart Journal of Social Sciences, 27(2), 225–233. retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/246404